Loudspeaker box



FIG. 1 is a front, left side and top perspective view of a loudspeaker box showing the new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left side elevation view thereof; and,

FIG. 6 is a top plan view thereof.

The portions of the design shown in broken lines show unclaimed subject matter. 

CLAIM The ornamental design for a loudspeaker box, as shown and described. 